chrome html5 视频 buffered.end 事件

Question

我正在尝试检测视频文件何时完成加载。我让它在 Firefox 和 safari 上成功运行，但在 chrome 上，缓冲事件的行为很奇怪.. 所以， 在我的本地主机 chrome 中工作正常，但是当我上传到服务器时；

1. 缓冲百分比在 %50 左右停止，但缓冲 %100，

2. 当页面刷新时，百分比保持在 %0 但它继续缓冲..

这是我的 javascript

function loaded()
        {
            var v = document.getElementById('myVideo');
            var r = v.buffered;
            var total = v.duration;
            var current=v.currentTime;
            var start = r.start(0);
                    var end = r.end(0); 
            var downloadPercent= Math.round((end / total)*100)
            $("#loadProgress").css('width',downloadPercent+ '%');

                    if(downloadPercent==100){
                $("#preloaderWrapper").fadeOut(function(){
                document.getElementById('myVideo').play();
                clearInterval(ratoteLoad);
                $(this).remove();                   
                    });             
            }       

        }   

            $('#myVideo').bind('progress', function() 
            {
                loaded();
            });

有什么想法吗？ 谢谢

Answer 1

试试这个：

myVideoTag = document.getElementById('video');
myVideoTag.addEventListener('progress', function(e) {
    var percent = null;
    // FF4+, Chrome
    if (myVideoTag && myVideoTag.buffered && myVideoTag.buffered.length > 0 && myVideoTag.buffered.end && myVideoTag.duration) {
        percent = myVideoTag.buffered.end(0) / myVideoTag.duration;
    } 
    // Some browsers (e.g., FF3.6 and Safari 5) cannot calculate target.bufferered.end()
    // to be anything other than 0. If the byte count is available we use this instead.
    // Browsers that support the else if do not seem to have the bufferedBytes value and
    // should skip to there. Tested in Safari 5, Webkit head, FF3.6, Chrome 6, IE 7/8.
    else if (myVideoTag && myVideoTag.bytesTotal != undefined && myVideoTag.bytesTotal > 0 && myVideoTag.bufferedBytes != undefined) {
        percent = myVideoTag.bufferedBytes / myVideoTag.bytesTotal;
    }

    if (percent !== null) {
        percent = 100 * Math.min(1, Math.max(0, percent));

        // ... do something with var percent here (e.g. update the progress bar)

    }

}, false);

... cmets 从 mediaelement.js 复制，代码也是如此，但经过调整以便在此处显示。我省略了 Firefox 3.0 的代码，因为它不太相关。 在所有当前浏览器中都能正常工作

PS：感谢 John Dyer for mejs - 很棒的东西 ;)